ALEXANDRIA, Va., April 9 -- United States Patent no. 12,273,041, issued on April 8, was assigned to Hitachi Ltd. (Tokyo).

"Bidirectional DC-DC converter with high control stability" was invented by Abhijit Choudhury (Tokyo) and Akihiko Kanouda (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "This bidirectional DC-DC converter comprises: a transformer; a first bridge circuit for converting DC power and AC power to each other which are input and output between a first DC power supply and the primary side of the transformer; a second bridge circuit for converting DC power and AC power to each other which are input and output between a second DC power supply and the secondary side of the transformer; a firs...